PC can't reach certain websites while connected to MX device

[ds154]

Hopefully posting this in the right spot but for months I have encountered this issue where anytime the users are connected to our wifi on the MX68W device they cannot access certain websites. It errors out and then says "connection reset" or something along those lines. When the user clears their Chrome or Edge cache they can access the website for about 10 seconds before it happens again. If they are on the schools guest wifi and not our wifi they can access the site without any issues. We have nothing blocking these websites and tested that they are accessible from both our main office and other locations with our internet. Zoom also has this issue at this one location where the website and app do not work. 

Our MX device is connected through the schools network directly out to the internet with no blocks and has a VPN tunnel back to our main office. Out of 60 sites we have running without issues, this one location is giving us a problem. 

Anyone encounter this issue before? 

[alemabrahao]

Do you have any content filters configured?

https://documentation.meraki.com/MX/Content_Filtering_and_Threat_Protection/Content_Filtering

[ds154]

No content filters on any of our 60 locations. I tried allowing these websites on the content filter to this specific MX with no change. I also tried adding a VPN exclusion rule for Zoom and the websites but it also did not work. 

[alemabrahao]

How about  threat protection?

https://documentation.meraki.com/MX/Content_Filtering_and_Threat_Protection/Threat_Protection

[ds154]

There is no threat protection enabled on any of our MX devices.

[alemabrahao]

Are you sure you don't have any settings? Not even an L7 firewall?

Because I use an MX67w at home and I don't have any problems related to accessing websites, but I do have content filtering enabled.

[pingfisher]

did you find out what this issue was with this? we are seeing similar problems with certain sites.